Closedir dirstream corruption check during directory crawling

dirstream.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>

#define _FILE_OFFSET_BITS 64

int main()
{
        DIR *dir = NULL;
        struct dirent *ptr;
        struct dirent *result;
        int fd = 0;

        dir = opendir(".");

        ptr = malloc(sizeof(*ptr) + (PATH_MAX + 1));
        if (ptr == NULL) {
                fprintf (stderr, "Malloc error");
                closedir(dir);
                return -1;
        }

        while ((readdir64_r(dir, ptr, &result) == 0)  && (result != NULL)) {
                if (!strcmp(ptr->d_name, ".") || !strcmp(ptr->d_name, ".."))
                        continue;
                fprintf (stdout, "I am here -> %s\n", ptr->d_name);
        }
        closedir(dir);
        return 0;
}